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I have W2K, XPx86, XPx64, VISTAx86 and VISTAx64 installed in my PC
system. RAM consits of two 2GB sticks.

I could install XPx64 only with the RAM configured as single channel
mode, and after installation, it could boot only with RAM configured for
single mode *despite* that all other OSes as above have no problem with
dual channel mode. Another thing noted is that the RAM operates as
DDR400 in dual channel mode while in single channel mode the speed slows
down to DDR333.

The problem symptom of booting the XPx64 with the RAM configured for
dual channel mode is that the boot process goes into rebooting cycle
right after Windows splash display. Note that the XPx64 was installed as
above.

Is there any remedy for this?

You need to look at your hardware, not Windows. I have
Vista x64 and XP x64 installed with 8GB of (4 x 2GB) Dual
Channel DDR2 RAM. It was there when I ran the installation
of both systems and it's still there - No problems.

I have also had XP Pro (32-bit) in the system checking
something out and it ran fine, but only sees about 3.5GB -
don't remember the exact figure right now.


churin wrote:
> I have W2K, XPx86, XPx64, VISTAx86 and VISTAx64 installed in my PC
> system. RAM consits of two 2GB sticks.
>
> I could install XPx64 only with the RAM configured as single channel
> mode, and after installation, it could boot only with RAM configured for
> single mode *despite* that all other OSes as above have no problem with
> dual channel mode. Another thing noted is that the RAM operates as
> DDR400 in dual channel mode while in single channel mode the speed slows
> down to DDR333.
>
> The problem symptom of booting the XPx64 with the RAM configured for
> dual channel mode is that the boot process goes into rebooting cycle
> right after Windows splash display. Note that the XPx64 was installed as
> above.
>
> Is there any remedy for this?
>
>

The problem is only with this Windows and is not with any other Windows
being older or newer than this particular Windows. So, the problem must
have something to do with this OS.

Nevertheless, you indicate that my hardware is to be blamed. Then how
can it be changed to remedy the problem.

Bobby Johnson wrote:
> You need to look at your hardware, not Windows. I have Vista x64 and XP
> x64 installed with 8GB of (4 x 2GB) Dual Channel DDR2 RAM. It was there
> when I ran the installation of both systems and it's still there - No
> problems.
>
> I have also had XP Pro (32-bit) in the system checking something out and
> it ran fine, but only sees about 3.5GB - don't remember the exact figure
> right now.
>
>
> churin wrote:
>> I have W2K, XPx86, XPx64, VISTAx86 and VISTAx64 installed in my PC
>> system. RAM consits of two 2GB sticks.
>>
>> I could install XPx64 only with the RAM configured as single channel
>> mode, and after installation, it could boot only with RAM configured
>> for single mode *despite* that all other OSes as above have no problem
>> with dual channel mode. Another thing noted is that the RAM operates
>> as DDR400 in dual channel mode while in single channel mode the speed
>> slows down to DDR333.
>>
>> The problem symptom of booting the XPx64 with the RAM configured for
>> dual channel mode is that the boot process goes into rebooting cycle
>> right after Windows splash display. Note that the XPx64 was installed
>> as above.
>>
>> Is there any remedy for this?
>>
>>

Churin:
XP x64 addresses ram sectors differently than XP and other operating
systems, which could be the cause. Running Memtest86 may find a bad sector
in the ram. Since XP x64 was in beta I have had 1 stick of ram that didn't
work due to a sector error. Also for dual channel the ram has to be matched
for proper operation. I have at least 6 XP x64 systems running 2 or 4 GB ram
in dual channel configuration without any problems. Have a great day.

--
Dennis Pack
XP x64 SP2, Vista Enterprise x64 SP1
WHS, Office Professional Plus 2007
"churin" <> wrote in message
news:...
>I have W2K, XPx86, XPx64, VISTAx86 and VISTAx64 installed in my PC system.
>RAM consits of two 2GB sticks.
>
> I could install XPx64 only with the RAM configured as single channel mode,
> and after installation, it could boot only with RAM configured for single
> mode *despite* that all other OSes as above have no problem with dual
> channel mode. Another thing noted is that the RAM operates as DDR400 in
> dual channel mode while in single channel mode the speed slows down to
> DDR333.
>
> The problem symptom of booting the XPx64 with the RAM configured for dual
> channel mode is that the boot process goes into rebooting cycle right
> after Windows splash display. Note that the XPx64 was installed as above.
>
> Is there any remedy for this?
>
>

I don't know what you can do. It is extremely difficult and
time consuming to attempt to troubleshoot anything when you
are not physically there to see exactly what's happening. I
know from experience that when trying to troubleshoot long
distance there is absolutely no guarantee that what is being
said on one side of the conversation is what's happening on
the other side of the conversation.

But, as I said before, I have 8GB (4 x 2GB) DDR2 installed
and configured in the dual-channel mode. I installed
Windows XP Professional x64 and Windows Vista Enterprise x64
with ALL 8GB of memory installed and have never encountered
any problems with either system. So, how can there be a
problem with either version of Windows? And, I'm sure I am
not the only person in the world that this works for.

The problem is either your hardware and/or how it's
configured. It's possible one or more pieces of hardware
has a flaw that cannot be fixed. Or, you are doing
something wrong - not using the correct drivers, or
something like that.



churin wrote:
> The problem is only with this Windows and is not with any other Windows
> being older or newer than this particular Windows. So, the problem must
> have something to do with this OS.
>
> Nevertheless, you indicate that my hardware is to be blamed. Then how
> can it be changed to remedy the problem.
>
> Bobby Johnson wrote:
>> You need to look at your hardware, not Windows. I have Vista x64 and
>> XP x64 installed with 8GB of (4 x 2GB) Dual Channel DDR2 RAM. It was
>> there when I ran the installation of both systems and it's still there
>> - No problems.
>>
>> I have also had XP Pro (32-bit) in the system checking something out
>> and it ran fine, but only sees about 3.5GB - don't remember the exact
>> figure right now.
>>
>>
>> churin wrote:
>>> I have W2K, XPx86, XPx64, VISTAx86 and VISTAx64 installed in my PC
>>> system. RAM consits of two 2GB sticks.
>>>
>>> I could install XPx64 only with the RAM configured as single channel
>>> mode, and after installation, it could boot only with RAM configured
>>> for single mode *despite* that all other OSes as above have no
>>> problem with dual channel mode. Another thing noted is that the RAM
>>> operates as DDR400 in dual channel mode while in single channel mode
>>> the speed slows down to DDR333.
>>>
>>> The problem symptom of booting the XPx64 with the RAM configured for
>>> dual channel mode is that the boot process goes into rebooting cycle
>>> right after Windows splash display. Note that the XPx64 was installed
>>> as above.
>>>
>>> Is there any remedy for this?
>>>
>>>

Dennis:
I understand it is desirable to get RAM sticks in pair if they are used
for dual channel operation. I did not follow the above and each stick
was obtained at different time although they are the same model. When I
got the second stick I ran Memtest86 for over four hours on Vista x86
with the RAM configured for dual channel mode and no error was reported.

You indicate that XPx64 addresses RAM sectors differently than XP and
other OS. Does the "other" OS include Vista x64 or do you mean that
64bit OS differs from 32bit OS in the above regard? Please note that
64bit Vista does not have any problem with the RAM configured for dual
channel operation.

Nevertheless, I am inclined to believe that cause of the problem is the
RAM which is not well matched. Although the pair works in dual channel
mode for Vista x64, their level of match is probably not sufficient
enough for XP x64.

Dennis Pack wrote:
> Churin:
> XP x64 addresses ram sectors differently than XP and other
> operating systems, which could be the cause. Running Memtest86 may find
> a bad sector in the ram. Since XP x64 was in beta I have had 1 stick of
> ram that didn't work due to a sector error. Also for dual channel the
> ram has to be matched for proper operation. I have at least 6 XP x64
> systems running 2 or 4 GB ram in dual channel configuration without any
> problems. Have a great day.
>

churin,
Download and run (no installation required) CPU-Z 1.45.
D/L link: http://www.cpuid.com/download/cpuz_145.zip
Go to the memory tab and take note of the timings the bios has assigned to
the memory.
Now go to the SPD tab which lists the manufacturer's recommended timings for
the memory in each slot.
Compare the readings of the "Memory" and "SPD" tabs.
See if there is any difference, maybe you are running one of the sticks
above the specs.
Carlos

"churin" wrote:

> Dennis:
> I understand it is desirable to get RAM sticks in pair if they are used
> for dual channel operation. I did not follow the above and each stick
> was obtained at different time although they are the same model. When I
> got the second stick I ran Memtest86 for over four hours on Vista x86
> with the RAM configured for dual channel mode and no error was reported.
>
> You indicate that XPx64 addresses RAM sectors differently than XP and
> other OS. Does the "other" OS include Vista x64 or do you mean that
> 64bit OS differs from 32bit OS in the above regard? Please note that
> 64bit Vista does not have any problem with the RAM configured for dual
> channel operation.
>
> Nevertheless, I am inclined to believe that cause of the problem is the
> RAM which is not well matched. Although the pair works in dual channel
> mode for Vista x64, their level of match is probably not sufficient
> enough for XP x64.
>
> Dennis Pack wrote:
> > Churin:
> > XP x64 addresses ram sectors differently than XP and other
> > operating systems, which could be the cause. Running Memtest86 may find
> > a bad sector in the ram. Since XP x64 was in beta I have had 1 stick of
> > ram that didn't work due to a sector error. Also for dual channel the
> > ram has to be matched for proper operation. I have at least 6 XP x64
> > systems running 2 or 4 GB ram in dual channel configuration without any
> > problems. Have a great day.
> >
>

In dual channel mode RAM frequency and its timing displayed on Memory
and SPD are the same as:
200MHz, 3.0-3-3-8
In single channel mode there are two different sets listed:
Memory: 166MHz, 2.5-3-3-7
SPD : 200MHz, 3.0-3-3-8

The both modules are the same model and are supposed to be DDR400. The
model is Patriot P5SD2G40036ERB. I have already noticed that the RAM
speed goes down from DDR400 to DDR333 if the RAM is congifured for
single channel mode.

Carlos wrote:
> churin,
> Download and run (no installation required) CPU-Z 1.45.
> D/L link: http://www.cpuid.com/download/cpuz_145.zip
> Go to the memory tab and take note of the timings the bios has assigned to
> the memory.
> Now go to the SPD tab which lists the manufacturer's recommended timings for
> the memory in each slot.
> Compare the readings of the "Memory" and "SPD" tabs.
> See if there is any difference, maybe you are running one of the sticks
> above the specs.
> Carlos
>
> "churin" wrote:
>
>> Dennis:
>> I understand it is desirable to get RAM sticks in pair if they are used
>> for dual channel operation. I did not follow the above and each stick
>> was obtained at different time although they are the same model. When I
>> got the second stick I ran Memtest86 for over four hours on Vista x86
>> with the RAM configured for dual channel mode and no error was reported.
>>
>> You indicate that XPx64 addresses RAM sectors differently than XP and
>> other OS. Does the "other" OS include Vista x64 or do you mean that
>> 64bit OS differs from 32bit OS in the above regard? Please note that
>> 64bit Vista does not have any problem with the RAM configured for dual
>> channel operation.
>>
>> Nevertheless, I am inclined to believe that cause of the problem is the
>> RAM which is not well matched. Although the pair works in dual channel
>> mode for Vista x64, their level of match is probably not sufficient
>> enough for XP x64.
>>
>> Dennis Pack wrote:
>>> Churin:
>>> XP x64 addresses ram sectors differently than XP and other
>>> operating systems, which could be the cause. Running Memtest86 may find
>>> a bad sector in the ram. Since XP x64 was in beta I have had 1 stick of
>>> ram that didn't work due to a sector error. Also for dual channel the
>>> ram has to be matched for proper operation. I have at least 6 XP x64
>>> systems running 2 or 4 GB ram in dual channel configuration without any
>>> problems. Have a great day.
>>>

It will work with 4x2GB dual channel as well as 2x. There is nothing
inherent to XP Pro x64 preventing it from working with a great deal more ram
than that.

It is a hardware issue, period. The BIOS, dram voltage, dram speed, and
mobo drivers are all things you have to look at. Also, the test reports
from the mobo manufacturer on the specific brand, speed, and latencies of
the ram you purchased. If the ram is not listed in the QVL by the mobo mfg
in the exact configuration you are using then your ram is probably not
compatible. If the mobo mfg hosts user forums those are your best source
of info.

I would get the assistance of a qualified technician and follow his advice
on the ram to use in your computer. The day is long past when any of us can
buy components individually strictly on their great specs and expect a good
result.

Some of the things
"churin" <> wrote in message
news:...
> The problem is only with this Windows and is not with any other Windows
> being older or newer than this particular Windows. So, the problem must
> have something to do with this OS.
>
> Nevertheless, you indicate that my hardware is to be blamed. Then how can
> it be changed to remedy the problem.
>
> Bobby Johnson wrote:
>> You need to look at your hardware, not Windows. I have Vista x64 and XP
>> x64 installed with 8GB of (4 x 2GB) Dual Channel DDR2 RAM. It was there
>> when I ran the installation of both systems and it's still there - No
>> problems.
>>
>> I have also had XP Pro (32-bit) in the system checking something out and
>> it ran fine, but only sees about 3.5GB - don't remember the exact figure
>> right now.
>>
>>
>> churin wrote:
>>> I have W2K, XPx86, XPx64, VISTAx86 and VISTAx64 installed in my PC
>>> system. RAM consits of two 2GB sticks.
>>>
>>> I could install XPx64 only with the RAM configured as single channel
>>> mode, and after installation, it could boot only with RAM configured for
>>> single mode *despite* that all other OSes as above have no problem with
>>> dual channel mode. Another thing noted is that the RAM operates as
>>> DDR400 in dual channel mode while in single channel mode the speed slows
>>> down to DDR333.
>>>
>>> The problem symptom of booting the XPx64 with the RAM configured for
>>> dual channel mode is that the boot process goes into rebooting cycle
>>> right after Windows splash display. Note that the XPx64 was installed as
>>> above.
>>>
>>> Is there any remedy for this?
>>>
>>>

I also am running XP Pro x64 and Vista Ultimate x64 on 8GB (4 sticks of dual
channel) of PC6400 (Samsung) memory. I stuck to the mobo mfg's QVL and read
the test reports before I bought the mobo or the ram. It takes that these
days to do a DIY box. It wasn't that way three or four years ago, but it
seems to be now.

One point folks miss is that just because the specs on a mobo say that the
board supports 8GB and that it supports 667/800/1066/1333 ram does not mean
it supports 8GB of 1333. More likely it supports 8GB at 667 or 800 and only
4GB at 1066/1333. It is a mess to figure out on your own.

"Bobby Johnson" <> wrote in message
news:u5Y$...
>I don't know what you can do. It is extremely difficult and time consuming
>to attempt to troubleshoot anything when you are not physically there to
>see exactly what's happening. I know from experience that when trying to
>troubleshoot long distance there is absolutely no guarantee that what is
>being said on one side of the conversation is what's happening on the other
>side of the conversation.
>
> But, as I said before, I have 8GB (4 x 2GB) DDR2 installed and configured
> in the dual-channel mode. I installed Windows XP Professional x64 and
> Windows Vista Enterprise x64 with ALL 8GB of memory installed and have
> never encountered any problems with either system. So, how can there be a
> problem with either version of Windows? And, I'm sure I am not the only
> person in the world that this works for.
>
> The problem is either your hardware and/or how it's configured. It's
> possible one or more pieces of hardware has a flaw that cannot be fixed.
> Or, you are doing something wrong - not using the correct drivers, or
> something like that.
>
>
>
> churin wrote:
>> The problem is only with this Windows and is not with any other Windows
>> being older or newer than this particular Windows. So, the problem must
>> have something to do with this OS.
>>
>> Nevertheless, you indicate that my hardware is to be blamed. Then how can
>> it be changed to remedy the problem.
>>
>> Bobby Johnson wrote:
>>> You need to look at your hardware, not Windows. I have Vista x64 and XP
>>> x64 installed with 8GB of (4 x 2GB) Dual Channel DDR2 RAM. It was there
>>> when I ran the installation of both systems and it's still there - No
>>> problems.
>>>
>>> I have also had XP Pro (32-bit) in the system checking something out and
>>> it ran fine, but only sees about 3.5GB - don't remember the exact figure
>>> right now.
>>>
>>>
>>> churin wrote:
>>>> I have W2K, XPx86, XPx64, VISTAx86 and VISTAx64 installed in my PC
>>>> system. RAM consits of two 2GB sticks.
>>>>
>>>> I could install XPx64 only with the RAM configured as single channel
>>>> mode, and after installation, it could boot only with RAM configured
>>>> for single mode *despite* that all other OSes as above have no problem
>>>> with dual channel mode. Another thing noted is that the RAM operates as
>>>> DDR400 in dual channel mode while in single channel mode the speed
>>>> slows down to DDR333.
>>>>
>>>> The problem symptom of booting the XPx64 with the RAM configured for
>>>> dual channel mode is that the boot process goes into rebooting cycle
>>>> right after Windows splash display. Note that the XPx64 was installed
>>>> as above.
>>>>
>>>> Is there any remedy for this?
>>>>
>>>>